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KMID : 1137820180390030134
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의공학회지
2018 Volume.39 No. 3 p.134 ~ p.139
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Mechanical Performance Comparison of Pedicle Screw Based on Design Parameters: Dual Lead and Dual Pitch
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Choi Sun-Gak
Cha Eun-Jong
Kim Kyung-Ah
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Abstract
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One of the most common problems with pedicle screw system is pullout of the screw. This study was performed to evaluate the pullout strength and driving torque of newly designed pedicle screws. The design of three type screws were standard pedicle screw, which had single lead threaded and single pitched design (Type A), single pitched and dual lead threaded pedicle screw (Type B), dual pitched and dual lead threaded pedicle screw (Type C), respectively. The tests were performed in accordance with the ASTM standards using polyurethane (PU) foam blocks. There was no significant difference in pullout strength among three types of screw. Type B and Type C exhibited higher insertion torque and removal torque than Type A, respectively (p<0.05). Pedicle screws newly developed with dual pitched and dual lead threaded design showed higher driving torque without decrease in pullout strength compared to the standard pedicle screw and could be inserted more rapidly with the same number of revolutions.
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KEYWORD
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Pedicle screw, Pullout strength, Driving torque, Dual lead, Dual pitch
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FullTexts / Linksout information
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Listed journal information
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